I am trying to create a collaborative whiteboard with socket.io and fabric.js.
When a user draws something I send the path to other users as a JSON format:
canvas.on('path:created', function(e) {
canvas.remove(fabric.Path.fromObject(JSON.stringify(e.path)));
socket.emit('add path', e.path.toJSON());
});
How can I recreate this object on the canvas here?
socket.on('add path', function(path) {
canvas.add(path); // doesn't work
});
try to use fabric.util.enlinvenObjects
The purpouse of that function is to switch from object form to istance.
socket.on('add path', function(path) {
fabric.util.enlivenObjects([path], function(objects) {
objects.forEach(function(o) {
canvas.add(o);
});
});
});
For those calling this function in a TypeScript project...
In my case setting namespace to empty string ('') and explicitly typing the callback argument made the function work smoothly.
fabric.util.enlivenObjects(
action.payload.objects,
(enlivedObjects: fabric.Object[]) => {
canvas.add(...enlivedObjects);
canvas.renderAll();
},
'');
I am using worlight JSONstore. I am new to it. I tried searching that read all docs but didn't get much idea.
I have one login page from that I get some json data I want to store that data using jsonstore. and get that afterwards.
I made jsonstore adapter.
Json-Store-Impl.js
function getJsonStores(custData) {
var data = custData;
return data;
//custdata is json
}
function addJsonStore(param1) {
var input = {
method : 'put',
returnedContentType : 'json',
path : 'userInputRequired'
};
return WL.Server.invokeHttp(input);
}
function updateJsonStore(param1) {
var input = {
method : 'post',
returnedContentType : 'json',
path : 'userInputRequired'
};
return WL.Server.invokeHttp(input);
}
function deleteJsonStore(param1) {
var input = {
method : 'delete',
returnedContentType : 'json',
path : 'userInputRequired'
};
return WL.Server.invokeHttp(input);
}
after that I Create a local JSON store.
famlCollection.js
;(function () {
WL.JSONStore.init({
faml : {
searchFields: {"response.mci.txnid":"string","response.mci.scrnseqnbr":"string","response.loginUser":"string","request.fldWebServerId":"string","response.fldRsaImageHeight":"string","request.fldRequestId":"string","request.fldTxnId":"string","response.fldDeviceTokenFSO":"string","response.fldRsaCollectionRequired":"string","response.datlastsuccesslogin":"string","response.fldRsaUserPhrase":"string","response.fldRsaAuthTxnId":"string","response.rc.returncode":"string","response.datcurrentlogin":"string","response.mci.deviceid":"string","response.customername":"string","request.fldDeviceId":"string","response.fldRsaUserStatus":"string","request.fldScrnSeqNbr":"string","response.fldRsaImageWidth":"string","request.fldLangId":"string","response.fldTptCustomer":"string","response.encflag":"string","response.rc.errorcode":"string","response.fldRsaImagePath":"string","response.mci.appid":"string","response.mci.requestid":"string","response.rc.errormessage":"string","response.mci.appserverid":"string","response.fldRsaCollectionType":"string","request.fldAppId":"string","response.fldRsaImageId":"string","request.fldLoginUserId":"string","response.mci.sessionid":"string","response.mci.langid":"string","response.mci.remoteaddress":"string","request.fldAppServerId":"string","response.mci.webserverid":"string","response.fldRsaImageText":"string","response.fldRsaEnrollRequired":"string","response.fldRsaActivityFlag":"string"},
adapter : {
name: 'JsonStore',
replace: 'updateJsonStore',
remove: 'deleteJsonStore',
add: 'addJsonStore',
load: {
procedure: 'getJsonStores',
params: [],
key: 'faml'
},
accept: function (data) {
return (data.status === 200);
}
}
}
}, {
password : 'PleaseChangeThisPassword'
})
.then(function () {
WL.Logger.debug(['Take a look at the JSONStore documentation and getting started module for more details and code samples.',
'At this point there is no data inside your collection ("faml"), but JSONStore is ready to be used.',
'You can use WL.JSONStore.get("faml").load() to load data from the adapter.',
'These are some common JSONStore methods: load, add, replace, remove, count, push, find, findById, findAll.',
'Most operations are asynchronous, wait until the last operation finished before calling the next one.',
'JSONStore is currently supported for production only in Android and iOS environments.',
'Search Fields are not dynamic, call WL.JSONStore.destroy() and then initialize the collection with the new fields.'].join('\n'));
})
.fail(function (errObj) {
WL.Logger.ctx({pretty: true}).debug(errObj);
});
}());
When I clicked on login button I call getJsonStores like this -
getJsonStores = function(){
custData = responseData();
var invocationData = {
adapter : "JsonStore",
procedure : "getJsonStores",
parameters : [custData],
compressResponse : true
};
//WL.Logger.debug('invoke msg '+invocationData, '');
WL.Client.invokeProcedure(invocationData, {
onSuccess : sucess,
onFailure : AdapterFail,
timeout: timeout
});
};
I followed these steps
Is this right way? and how can I check jsonstore working locally or not? and how can I store my jsondata in JSONStore? Where should I initialize the wlCommonInit function in project?
plz Help me out.
Open main.js and find the wlCommonInit function, add the JSONStore init code.
WL.JSONStore.init(...)
You already have an adapter that returns the data you want to add to JSONStore, call it any time after init has finished.
WL.Client.invokeProcedure(...)
Inside the onSuccess callback, a function that gets executed when you successfully get data from the adapter, start using the JSONStore API. One high level way to write the code would be, if the collection is empty (the count API returns 0), then add all documents to the collection.
WL.JSONStore.get(collectionName).count()
.then(function (countResult) {
if(countResult === 0) {
//collection is empty, add data
WL.JSONStore.get(collectionName).add([{name: 'carlos'}, {name: 'mike'}])
.then(function () {
//data stored succesfully
});
}
});
Instead of adding [{name: 'carlos'}, {name: 'mike'}] you probably want to add the data returned from the adapter.
Later in your application, you can use the find API to get data back:
WL.JSONStore.get(collectionName).findAll()
.then(function (findResults) {
//...
});
There is also a find API that takes queries (e.g. {name: 'carlos'}), look at the getting started module here and the documentation here.
It's worth mentioning that the JSONStore API is asynchronous, you must wait for the callbacks in order to perform the next operation.
I tried to accomplish the tutorial here, and when I used their data service, it worked just fine.
I modified the source to my data service (WCF Data Service v5.6, OData V2), and the list just shows the Loading sign and nothing happens.
The code should load any data type, it just has to be mapped accordingly. My service is availabe through the browser, I checked.
Here is the code:
DevExTestApp.home = function (params) {
var viewModel = {
dataSource: DevExpress.data.createDataSource({
load: function (loadOptions) {
if (loadOptions.refresh) {
try {
var deferred = new $.Deferred();
$.get("http://192.168.1.101/dataservice/dataservice.svc/People")
.done(function (result) {
var mapped = $.map(result, function (data) {
return {
name: data.Name
}
});
deferred.resolve(mapped);
});
}
catch (err) {
alert(err.message);
}
return deferred;
}
}
})
};
return viewModel;
}
What else should I set?
The try-catch block would not help is this case, because data loading is async. Instead, subscribe to the fail callback:
$.get(url)
.done(doneFunc)
.fail(failFunc);
Another common problem with accessing a web service from JavaScript is Same-Origin Policy. Your OData service have to support either CORS or JSONP. Refer to this discussion.
I have a service which retrieves data from the datastore (Web SQL). Afterwards, it stores the data in a AngularJS array. The problem is that this does not initiate changes to the UI.
Contrary, if after the retrieval of data from datastore, I call a web services using a $get method and append the results to the previous array, all data updates the UI.
Any suggestions? Is it possible that I fill the array before the Angular binds the variable?
Can I somehow delay the execution of the service?
Most of the code has been taken from the following example: http://vojtajina.github.io/WebApp-CodeLab/FinalProject/
In order for the UI to magically update, some changes must happen on properties of the $scope. For example, if retrieving some users from a rest resource, I might do something like this:
app.controller("UserCtrl", function($http) {
$http.get("users").success(function(data) {
$scope.users = data; // update $scope.users IN the callback
}
)
Though there is a better way to retrieve data before a template is loaded (via routes/ng-view):
app.config(function($routeProvider, userFactory) {
$routeProvider
.when("/users", {
templateUrl: "pages/user.html",
controller: "UserCtrl",
resolve: {
// users will be available on UserCtrl (inject it)
users: userFactory.getUsers() // returns a promise which must be resolved before $routeChangeSuccess
}
}
});
app.factory("userFactory", function($http, $q) {
var factory = {};
factory.getUsers = function() {
var delay = $q.defer(); // promise
$http.get("/users").success(function(data){
delay.resolve(data); // return an array of users as resolved object (parsed from JSON)
}).error(function() {
delay.reject("Unable to fetch users");
});
return delay.promise; // route will not succeed unless resolved
return factory;
});
app.controller("UserCtrl", function($http, users) { // resolved users injected
// nothing else needed, just use users it in your template - your good to go!
)
I have implemented both methods and the latter is far desirable for two reasons:
It doesn't load the page until the resource is resolved. This allows you to place a loading icon, etc, by attaching handlers on the $routeChangeStart and $routeChangeSuccess.
Furthermore, it plays better with 'enter' animations in that, all your items don't annoyingly play the enter animation every time the page is loaded (since $scope.users is pre populated as opposed to being updated in a callback once the page has loaded).
Assuming you're assigning the data to the array in the controller, set an $scope.$apply() after to have the UI update.
Ex:
$scope.portfolio = {};
$scope.getPortfolio = function() {
$.ajax({
url: 'http://website.com:1337/portfolio',
type:'GET',
success: function(data, textStatus, jqXHR) {
$scope.portfolio = data;
$scope.$apply();
},
error: function(jqXHR, textStatus, errorThrown) {
console.log(errorThrown);
}
});
};
Updated code and issue:
I am creating a test harness for my RPC server. Currently it consists of a page which immeadiately fires off an AJAX request to retrieve all functions on the server. Once that is returned it creates a list of buttons so I can click to test. Eventually I will add dialog boxes to test parameter passing to the functions but currently I want to just fire off the basic request when I click the button. The issue I am seeing is that the onclick function is always firing the last function in the list presumably because when the click is fired key is set to the last value in the array. I thought to pass button.innerHTML value but that too suffers that the last button.innerHTML is that of the final key.
What do I need to do to fire off the action correctly?
Here is the business end of the code:
$(document).ready(function() {
$.jsonRPC.setup({
endPoint: '//api.localhost/index.php'
});
$.jsonRPC.request('getExampleData', {
params: [],
success: function(result) {
for (var key in result.result) {
console.log(key+' => '+result.result[key]);
var button = document.createElement('button');
button.innerHTML = result.result[key];
button.onclick = function() { callRPCFunction(result.result[key]); return false; }
var foo = document.getElementById("page");
foo.appendChild(button);
}
},
error: function(result) {
console.log(result);
}
});
});
function callRPCFunction(target) {
$.jsonRPC.request(target, {
params: [],
success: function(result) {
console.log(result);
},
error: function(result) {
console.log(result);
}
});
}
Assignment to element.onClick will not work until the element is added to the DOM. You may call element.onClick(callRPCFunction(result.result[key])); after foo.appendChild(element);. That might work!
You may use jQuery's live() here, it was created for these purposes:
$(element).live('click', callRPCFunction(result.result[key])